This proposed paper introduces the more effectiveness of power transferring in dc micro-grid powe... more This proposed paper introduces the more effectiveness of power transferring in dc micro-grid power distribution in order to comprehend the usage of home appliances. A 300V 5-level diode clamped multilevel is operated as power source for contactless power transfer with a selective harmonic elimination(SHE) technique, and the output is set at 48 V 300W with the efficiency at 92.6%. The converter generates 200 kHz switching frequency to send a highly magnetic coupling through primary coil over ferromagnetic material in tight coupling condition. The paper aims are to eliminate the electric shock, galvanic isolation and arch free in dc to dc power conversion. Additionally, the lower %THD can reduce designed parameters which mean the power density will be increased. The output will be illustrated in both simulation and implementation results.
2022 International Electrical Engineering Congress (iEECON), Mar 9, 2022
Studying the comparison of the performance of battery packing between screw welding technique and... more Studying the comparison of the performance of battery packing between screw welding technique and laser beam welding technique, both battery packing techniques have different advantages and disadvantages to different manufacture and assembling. The research is testing the performance of using battery packing in both techniques by choosing the Lithium iron phosphate(LFP) battery manufactured and distributed in the present market. This research will compare the life cycle testing, which tests the battery life performance, testing DC internal resistance of the battery, and comparing the battery's temperature increase while the battery discharged. To collect the performance testing data and choose the most suitable for application use with suitable battery packing technique.
The droop control strategy of an AC microgrid in islanding mode is presented in this paper. The f... more The droop control strategy of an AC microgrid in islanding mode is presented in this paper. The frequency reference of islanding mode is recalculated from proposed droop control technique due to the loss of grid reference frequency. The fast response of both voltage and frequency of the AC microgrid during an islanding operation is required in order to maintain the frequency and voltage stability. The understanding of control strategy of each inverter needs to investigate for better application which is also explained. The Matlab/Simulink is used to validate the proposed droop control. The simulation result shows that proposed droop control strategy can control active and reactive power of an AC microgrid satisfactory.
The aim of this paper is to present the solid state transformer integrated with PV farm applicati... more The aim of this paper is to present the solid state transformer integrated with PV farm applications in the distribution system of PEA grid. A Modular Multilevel Inverter (MMI) circuit, which can be connected to a 22 kVL-L transmission system is also presented in this paper. The MMI has the capability of current limit if the short circuit fault occurs. The topology of the proposed MMI is the three-level three-phase inverter with the reduced voltage for laboratory use. The proposed idea focusing only on the MMI is validated by simulation and substantiate by the experiment.
Publisher Summary This chapter demonstrates the state of the art of multilevel power converter te... more Publisher Summary This chapter demonstrates the state of the art of multilevel power converter technology, discussing fundamental multilevel converter structures and modulation paradigms. A multilevel converter not only achieves high power ratings but also enables the use of renewable energy sources. A multilevel converter has several advantages over a conventional two-level converter that uses high switching frequency pulse width modulation (PWM). Multilevel converters produce smaller CM voltage and can draw input current with low distortion. Existing multilevel converters such as diode-clamped and capacitor-clamped multilevel converters can be derived from the generalized converter topology called P2 topology. To reduce the number of separate dc sources for high-voltage, high-power applications with multilevel converters, diode clamped or capacitor-clamped converters can be used to replace the full-bridge cell in a cascaded converter. Two multilevel converters can be connected in a back-to-back arrangement, and then the combination can be connected to the electrical system in a series-parallel arrangement.
This paper describes the operation and control methodology for a Battery Energy Storage System (B... more This paper describes the operation and control methodology for a Battery Energy Storage System (BESS) designed to mitigate the negative impacts of lithium-ion energy storage. The Battery Monitoring System (BMS) provides real time status data of the battery’s parameters such as current voltage and temperature in order to prevent energy storage deterioration. The data will be sent through CAN-bus that allows microcontrollers and other devices to communicate with each other in applications without a host computer. Including, energy provision.
2022 International Electrical Engineering Congress (iEECON), Mar 9, 2022
A study of Demand Response (DR) function and Energy management for an electrical vehicle (EV) cha... more A study of Demand Response (DR) function and Energy management for an electrical vehicle (EV) charger is presented in this paper. The proposed technique is to prevent the electrical system within the rated power by controlling electric vehicle chargers loads to the electrical system. A power management method for limiting the charging current and charging time by using state of charge (SoC) as a priority point index is developed. The power management method is also developed as a calculation algorithm for determining the charging current limit rating for electric vehicle chargers. The simulation model is also developed for validating a DR management function of the electric vehicle charger according to Provincial Electricity Authority of Thailand (PEA) load characteristic data. The results show that the proposed DR function can manage the charging current of each electric vehicle charger appropriately. Also. the proposed technique can prevent the rated power demand of the transformer distribution. The study illustrates that this method is an effective protection for the distribution transformer and can be able to apply as a DR function to manage electrical energy more efficiently
2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2017
This paper presents design and control a suitable power electronics transformer (Solid State Tran... more This paper presents design and control a suitable power electronics transformer (Solid State Transformer, SST) that is suitable for applying to be application in solar farm in Thailand by using Power Simulation Version 9.1 (PSIM 9.1). SmartCtrl is a toolbox of the PSIM 9.1 program that is used to design PI controllers and find the optimal gain automatically. The advantages of designing a controller with SmartCtrl are used to interface or work with other applications, simplified to use and not complicated, simulation results are easy to understand and analyze, and the controller from the design is stable. The PI controller from the design from the SmartCtrl to for using with Solid State Transformer in solar farm applications work satisfied and very well as confirmed by the simulation results.
2015 18th International Conference on Electrical Machines and Systems (ICEMS), 2015
The aim of this paper is to propose the application of the DC-link current sensors of the back-to... more The aim of this paper is to propose the application of the DC-link current sensors of the back-to-back converters for operation of a doubly-fed induction generator (DFIG). The operation of the DFIG is first discussed. The measured DC-link currents are used reconstruct the AC current waveforms for operation of the DFIG under different operating modes. The feasibility of the proposed application is investigated by simulation and experiment. The limitations of the proposed topology are discussed. The fault tolerant operation while the fault occurs at the AC current sensors is also discussed.
2019 7th International Electrical Engineering Congress (iEECON), 2019
This proposed paper introduces the fault detection method for solar cell with Box Plot technique ... more This proposed paper introduces the fault detection method for solar cell with Box Plot technique on the Solid State Transformer (SST) for the solar farm application. The Box Plot technique with inclusive quartile value is functioned for finding the upper and lower limit for data analysis. Normally, the fault detections of solar panels are found by using the PV string current from the SST to calculate the upper and lower limit of the Box Plot. If one of the string currents is in the specific outer boundary, therefore, the solar panels are in non-operational condition mode. Generally, the fault detection testing for the solar panels can be categorized in 5 cases: normal condition, open circuit condition, line-line condition, partial shading condition and degradation condition. Finally, based on the simulation result and the actual results, the Box Plot is able to monitor the performance of the PV string according to various conditions as efficiently as possible and accurate.
2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2017
Reactive power compensation for solving voltage problem in PV farm based upon IEC 61850 is presen... more Reactive power compensation for solving voltage problem in PV farm based upon IEC 61850 is presented in this paper in order to control voltage within acceptable range. The Volt/VAR control is used in solar inverter of PV farm to improve power quality and also reduce the disconnection of solar inverter caused by overvoltage. So, the owner of PV farm will get more opportunity to sell solar electricity back to the grid. For Volt/VAR control, solar inverter with PQ mode is used to control the active and reactive power of the system. Electricity data from substation are sent to PLC based upon IEC 61850, which is the standard communication of electrical substation system. In this paper, simulation result verifies that Volt/VAR can be improve a power quality in a PV farm.
2021 18th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2021
This paper presents the electric vehicle (EV) wireless charger by using the practical design freq... more This paper presents the electric vehicle (EV) wireless charger by using the practical design frequency converter. A 500 W LLC series resonant full-bridge converter for demonstrating prototype with the standard charging frequency range 85 kHz to 100 kHz is connected to the transmission coils with 10 cm air gap and performed a power transfer from the source to the EV batteries. The resonant converter with the Fundamental Harmonic Approximation (FHA) technique is chosen in this proposed paper for transferring the highly magnetic coupling between the transmitter side to the pickup side. The overall system is designed by MATLAB/Simulink program, and the experimental result efficiency can be measured out by approximately 80%.
2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
The main idea of using a dc to dc plug and outlet with high efficiency for household appliances i... more The main idea of using a dc to dc plug and outlet with high efficiency for household appliances is proposed in this paper. A five-level, 300-W, 200-kHz diode-clamped multilevel technique with selective harmonic elimination is utilized as a power source with input from a 300-V DC link bus and output controlled at 48V. A contactless transformer with an air core and a ferromagnetic material core was chosen in this study for testing and evaluation. Electric shock elimination, galvanic isolation, and arc-free operation can be achieved with this scheme. Additionally, the design’s low total harmonic distortion can reduce the size of the inductive power transformer core and increase the power density of the system. Moreover, an LLC series resonance technique with fundamental harmonic approximation (FHA) was designed and added to the rear side of the power converter to achieve the zero voltage switching condition. Finally, the outcome is illustrated by both MATLAB/Simulink and experimental r...
This proposed paper introduces the more effectiveness of power transferring in dc micro-grid powe... more This proposed paper introduces the more effectiveness of power transferring in dc micro-grid power distribution in order to comprehend the usage of home appliances. A 300V 5-level diode clamped multilevel is operated as power source for contactless power transfer with a selective harmonic elimination(SHE) technique, and the output is set at 48 V 300W with the efficiency at 92.6%. The converter generates 200 kHz switching frequency to send a highly magnetic coupling through primary coil over ferromagnetic material in tight coupling condition. The paper aims are to eliminate the electric shock, galvanic isolation and arch free in dc to dc power conversion. Additionally, the lower %THD can reduce designed parameters which mean the power density will be increased. The output will be illustrated in both simulation and implementation results.
2022 International Electrical Engineering Congress (iEECON), Mar 9, 2022
Studying the comparison of the performance of battery packing between screw welding technique and... more Studying the comparison of the performance of battery packing between screw welding technique and laser beam welding technique, both battery packing techniques have different advantages and disadvantages to different manufacture and assembling. The research is testing the performance of using battery packing in both techniques by choosing the Lithium iron phosphate(LFP) battery manufactured and distributed in the present market. This research will compare the life cycle testing, which tests the battery life performance, testing DC internal resistance of the battery, and comparing the battery's temperature increase while the battery discharged. To collect the performance testing data and choose the most suitable for application use with suitable battery packing technique.
The droop control strategy of an AC microgrid in islanding mode is presented in this paper. The f... more The droop control strategy of an AC microgrid in islanding mode is presented in this paper. The frequency reference of islanding mode is recalculated from proposed droop control technique due to the loss of grid reference frequency. The fast response of both voltage and frequency of the AC microgrid during an islanding operation is required in order to maintain the frequency and voltage stability. The understanding of control strategy of each inverter needs to investigate for better application which is also explained. The Matlab/Simulink is used to validate the proposed droop control. The simulation result shows that proposed droop control strategy can control active and reactive power of an AC microgrid satisfactory.
The aim of this paper is to present the solid state transformer integrated with PV farm applicati... more The aim of this paper is to present the solid state transformer integrated with PV farm applications in the distribution system of PEA grid. A Modular Multilevel Inverter (MMI) circuit, which can be connected to a 22 kVL-L transmission system is also presented in this paper. The MMI has the capability of current limit if the short circuit fault occurs. The topology of the proposed MMI is the three-level three-phase inverter with the reduced voltage for laboratory use. The proposed idea focusing only on the MMI is validated by simulation and substantiate by the experiment.
Publisher Summary This chapter demonstrates the state of the art of multilevel power converter te... more Publisher Summary This chapter demonstrates the state of the art of multilevel power converter technology, discussing fundamental multilevel converter structures and modulation paradigms. A multilevel converter not only achieves high power ratings but also enables the use of renewable energy sources. A multilevel converter has several advantages over a conventional two-level converter that uses high switching frequency pulse width modulation (PWM). Multilevel converters produce smaller CM voltage and can draw input current with low distortion. Existing multilevel converters such as diode-clamped and capacitor-clamped multilevel converters can be derived from the generalized converter topology called P2 topology. To reduce the number of separate dc sources for high-voltage, high-power applications with multilevel converters, diode clamped or capacitor-clamped converters can be used to replace the full-bridge cell in a cascaded converter. Two multilevel converters can be connected in a back-to-back arrangement, and then the combination can be connected to the electrical system in a series-parallel arrangement.
This paper describes the operation and control methodology for a Battery Energy Storage System (B... more This paper describes the operation and control methodology for a Battery Energy Storage System (BESS) designed to mitigate the negative impacts of lithium-ion energy storage. The Battery Monitoring System (BMS) provides real time status data of the battery’s parameters such as current voltage and temperature in order to prevent energy storage deterioration. The data will be sent through CAN-bus that allows microcontrollers and other devices to communicate with each other in applications without a host computer. Including, energy provision.
2022 International Electrical Engineering Congress (iEECON), Mar 9, 2022
A study of Demand Response (DR) function and Energy management for an electrical vehicle (EV) cha... more A study of Demand Response (DR) function and Energy management for an electrical vehicle (EV) charger is presented in this paper. The proposed technique is to prevent the electrical system within the rated power by controlling electric vehicle chargers loads to the electrical system. A power management method for limiting the charging current and charging time by using state of charge (SoC) as a priority point index is developed. The power management method is also developed as a calculation algorithm for determining the charging current limit rating for electric vehicle chargers. The simulation model is also developed for validating a DR management function of the electric vehicle charger according to Provincial Electricity Authority of Thailand (PEA) load characteristic data. The results show that the proposed DR function can manage the charging current of each electric vehicle charger appropriately. Also. the proposed technique can prevent the rated power demand of the transformer distribution. The study illustrates that this method is an effective protection for the distribution transformer and can be able to apply as a DR function to manage electrical energy more efficiently
2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2017
This paper presents design and control a suitable power electronics transformer (Solid State Tran... more This paper presents design and control a suitable power electronics transformer (Solid State Transformer, SST) that is suitable for applying to be application in solar farm in Thailand by using Power Simulation Version 9.1 (PSIM 9.1). SmartCtrl is a toolbox of the PSIM 9.1 program that is used to design PI controllers and find the optimal gain automatically. The advantages of designing a controller with SmartCtrl are used to interface or work with other applications, simplified to use and not complicated, simulation results are easy to understand and analyze, and the controller from the design is stable. The PI controller from the design from the SmartCtrl to for using with Solid State Transformer in solar farm applications work satisfied and very well as confirmed by the simulation results.
2015 18th International Conference on Electrical Machines and Systems (ICEMS), 2015
The aim of this paper is to propose the application of the DC-link current sensors of the back-to... more The aim of this paper is to propose the application of the DC-link current sensors of the back-to-back converters for operation of a doubly-fed induction generator (DFIG). The operation of the DFIG is first discussed. The measured DC-link currents are used reconstruct the AC current waveforms for operation of the DFIG under different operating modes. The feasibility of the proposed application is investigated by simulation and experiment. The limitations of the proposed topology are discussed. The fault tolerant operation while the fault occurs at the AC current sensors is also discussed.
2019 7th International Electrical Engineering Congress (iEECON), 2019
This proposed paper introduces the fault detection method for solar cell with Box Plot technique ... more This proposed paper introduces the fault detection method for solar cell with Box Plot technique on the Solid State Transformer (SST) for the solar farm application. The Box Plot technique with inclusive quartile value is functioned for finding the upper and lower limit for data analysis. Normally, the fault detections of solar panels are found by using the PV string current from the SST to calculate the upper and lower limit of the Box Plot. If one of the string currents is in the specific outer boundary, therefore, the solar panels are in non-operational condition mode. Generally, the fault detection testing for the solar panels can be categorized in 5 cases: normal condition, open circuit condition, line-line condition, partial shading condition and degradation condition. Finally, based on the simulation result and the actual results, the Box Plot is able to monitor the performance of the PV string according to various conditions as efficiently as possible and accurate.
2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2017
Reactive power compensation for solving voltage problem in PV farm based upon IEC 61850 is presen... more Reactive power compensation for solving voltage problem in PV farm based upon IEC 61850 is presented in this paper in order to control voltage within acceptable range. The Volt/VAR control is used in solar inverter of PV farm to improve power quality and also reduce the disconnection of solar inverter caused by overvoltage. So, the owner of PV farm will get more opportunity to sell solar electricity back to the grid. For Volt/VAR control, solar inverter with PQ mode is used to control the active and reactive power of the system. Electricity data from substation are sent to PLC based upon IEC 61850, which is the standard communication of electrical substation system. In this paper, simulation result verifies that Volt/VAR can be improve a power quality in a PV farm.
2021 18th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2021
This paper presents the electric vehicle (EV) wireless charger by using the practical design freq... more This paper presents the electric vehicle (EV) wireless charger by using the practical design frequency converter. A 500 W LLC series resonant full-bridge converter for demonstrating prototype with the standard charging frequency range 85 kHz to 100 kHz is connected to the transmission coils with 10 cm air gap and performed a power transfer from the source to the EV batteries. The resonant converter with the Fundamental Harmonic Approximation (FHA) technique is chosen in this proposed paper for transferring the highly magnetic coupling between the transmitter side to the pickup side. The overall system is designed by MATLAB/Simulink program, and the experimental result efficiency can be measured out by approximately 80%.
2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
The main idea of using a dc to dc plug and outlet with high efficiency for household appliances i... more The main idea of using a dc to dc plug and outlet with high efficiency for household appliances is proposed in this paper. A five-level, 300-W, 200-kHz diode-clamped multilevel technique with selective harmonic elimination is utilized as a power source with input from a 300-V DC link bus and output controlled at 48V. A contactless transformer with an air core and a ferromagnetic material core was chosen in this study for testing and evaluation. Electric shock elimination, galvanic isolation, and arc-free operation can be achieved with this scheme. Additionally, the design’s low total harmonic distortion can reduce the size of the inductive power transformer core and increase the power density of the system. Moreover, an LLC series resonance technique with fundamental harmonic approximation (FHA) was designed and added to the rear side of the power converter to achieve the zero voltage switching condition. Finally, the outcome is illustrated by both MATLAB/Simulink and experimental r...
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Papers by Surin Khomfoi